Which preposition to use with unmentionables

of Occurrences 2%

His lower spars were cased in tight unmentionables of what had once been white kerseymere, and long boots, the coal-scuttle tops of which served as scuppers to carry off the drainings from his coat-flaps in bad weather; he was, in fact, the "last of the sea-monsters," but, like all his tribe, as brave as steel, and, when put to it, as alert as a cat.

for Occurrences 1%

Furthermore, widows have a way of appearing to be loaded down with ducats, when, in reality, they are pawning the late defunct's unmentionables for the means of existence.

Which preposition to use with  unmentionables